eG Monitoring
 

Measures reported by CtxSDXXenDiskTest

To ensure peak performance of an SDX appliance, it needs to be sized with adequate physical disk resources. If not, then frequent disk space contention and I/O overloads will end up significantly degrading the performance of the appliance. To avoid this, administrators must closely track physical disk usage, proactively alert administrators to a potential disk space crunch or a disk I/O contention, and thus enable administrators to initiate corrective action.

This is exactly what the CtxSDXXenDiskTest test does. This test auto-discovers the physical disks supported by the SDX appliance, and for each physical disk, reports the current capacity, space usage, and the I/O activity on that disk. In the process, the test points to the disks that are not sized commensurate to their usage. Based on the pointers provided by this test, administrators can then proceed to resize their storage.

Outputs of the test : One set of results for each physical disk on the target NetScaler SDX.

Measurement Description Measurement Unit Interpretation
Disk_size Indicates the current capacity of this disk. GB  
Disk_utilized Indicates the amount of space in this disk that is utilized. GB A low value is desired for this measure.
Disk_free Indicates the amount of space in this disk that is currently unused. GB A high value is desired for this measure.
Disk_usage Indicates the percentage of space in this disk that is in use. Percent Compare the value of this measure across disks to know which disk is being used excessively.

Typically, a value close to 100% is a cause for concern, as it implies that the disk is running out of space. You may want to consider adding more storage resources to prevent a serious storage contention.
Transactions Indicates the rate of transactions to this disk. Transactions/Sec This is a good indicator of the level of I/O activity on a disk.
Block_reads Indicates the rate at which data blocks are read from this disk. reads/Sec You can use this value to measure the rate of output from the disk.
Block_written Indicates the rate at which data blocks are written to this disk. Writes/Sec You can use this value to measure the rate of input from the disk.
Total_blocks Indicates the rate at which I/O operations are performed on this disk. Operations/Sec This is a good indicator of the workload of a disk. Compare the value of this measure across disks to identify that disk that is experiencing an I/O overload.